/* JAI-Ext - OpenSource Java Advanced Image Extensions Library
 *    http://www.geo-solutions.it/
 *    Copyright 2018 GeoSolutions
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 *  Copyright (c) 2011, Michael Bedward. All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 *  - Redistributions in binary form must reproduce the above copyright notice, this
 *    list of conditions and the following disclaimer in the documentation and/or
 *    other materials provided with the distribution.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.imagen.media.jiffle.runtime;

import java.awt.Point;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;

/**
 * Wraps an AffineTransform object for use as a Jiffle {@link CoordinateTransform}.
 *
 * @author Michael Bedward
 * @since 0.1
 * @version $Id$
 */
public class AffineCoordinateTransform implements CoordinateTransform {
    private final AffineTransform affine;
    private Point2D p2D;

    /**
     * Creates a new instance to wrap the given {@code AffineTransform}. If {@code tr} is {@code null} an identity
     * transform will be used. The input transform is copied.
     *
     * @param affine the transform
     */
    public AffineCoordinateTransform(AffineTransform affine) {
        this.affine = affine == null ? new AffineTransform() : new AffineTransform(affine);
        p2D = new Point2D.Double();
    }

    /** {@inheritDoc} */
    public Point worldToImage(double x, double y, Point p) {
        p2D.setLocation(x, y);
        affine.transform(p2D, p2D);

        if (p != null) {
            p.x = (int) Math.round(p2D.getX());
            p.y = (int) Math.round(p2D.getY());
        } else {
            p = new Point((int) Math.round(p2D.getX()), (int) Math.round(p2D.getY()));
        }

        return p;
    }
}
